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Adjustable Voltage Regulator Resistor Divider Calculator

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Adjustable Voltage Regulator Resistor Divider Calculator

Calculate R2 for an adjustable voltage regulator (LM317, LM350, etc.) given desired output voltage and R1.

Inputs
Typical: 240Ω for LM317
LM317 Vref = 1.25V
Results
R2 Required
—
Actual Vout
—
Formula: Vout = Vref × (1 + R2/R1)
R2 = R1 × (Vout/Vref − 1)

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About this tool

Adjustable Voltage Regulator Resistor Divider Calculator is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.